<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Size</title>
<style type="text/css">
div {
	width: 800px;
	height: 500px;
	background: url("bg1.jpg") no-repeat;
	background-size: contain;
	background-size: cover;
	background-size: 800px 500px;
	background-size: 800px;
	background-size: 50% 50%;
	background-size: 50%;
	background-size: 100% 100%;
	background-size: 100%;
}
</style>
</head>
<body>
<div></div>
</body>
</html>